Datasheet

MAX16997/MAX16998
High-Voltage Watchdog Timers with
Adjustable Timeout Delay
_______________________________________________________________________________________ 7
Timing Diagrams
V
EN
V
HYST
t
WP INITIAL
t
WP INITIAL
= WATCHDOG TIMEOUT PERIOD x 8 t
WP
= WATCHDOG TIMEOUT PERIOD t
WDI
= WDI TRIGGER PERIOD
3 CONSECUTIVE t
WP
WITHOUT TRIGGER ENABLE GOES LOW 3 CONSECUTIVE WATCHDOG TRIGGER (WDI) ENABLE GOES ACTIVE HIGH
t
WP
t
WD
t
WP
t
WP
1
2
312
3
t
WP
t
WP
t
WDI
t
WDI
t
WDI
t
WDI
V
PON
WDI
ENABLE
Figure 1. MAX16997A Timing Diagram
V
RESETIN
V
HYST
t
RESET
= RESET TIMEOUT PERIOD t
WP
= WATCHDOG TIMEOUT PERIOD t
WDI
= WDI TRIGGER PERIOD
3 CONSECUTIVE RESETS ENABLE GOES ACTIVE LOW 3 CONSECUTIVE WATCHDOG TRIGGER (WDI) ENABLE GOES ACTIVE HIGH
1
1
2
2
3
3
t
WP
t
WDI
t
WP
t
WP
t
WP
t
WDI
t
WDI
t
WDI
t
RESET
V
PON
WDI
ENABLE
RESET
Figure 2. MAX16998A Timing Diagram